Haggai
חַגַּי
Meaning: Festive, my feast
Gematria: 21
חַי יְהוָה וּבָרוּךְ צוּרִי וְיָרֹם אֱלֹהֵי יִשְׁעִי
Shmuel II 22:47
Translation: As Hashem lives, and blessed be my Rock, and exalted be the Hashem of my salvation. (Shmuel II 22:47)
Spiritual meaning:
The prophet who encouraged the rebuilding of the Temple, representing celebration and divine service
https://shemli.org/names/haggai